Jay,
If the 'bond and assembly' approach is an option, the runners, as long as they have a draft, and can have their cores removed, can be made from aluminum and reused if coated with a mold release. To avoid vacuum bagging, industrial shrink tubing, similar to what you'd use on wiring, can be used as well. You'd wrap the a-stage laminate on the aluminum mold, slide the shrink tube over it, warm it so it starts to contract, and then during cure it will continue to de-bulk and give a nice outside finish.
You could make a bunch of runners, set the oven, go to work, and come home and they're done. Then its a matter of bonding the runners to existing aluminum adapters, letting that ambient cure, then they're ready to go.
I guess in my head I was thinking of a monolithic assembly, but a 'bond and assembly' approach would make more sense given limited time.
Joe